"Sigma" can refer to;
These are photos from concerts where Sigma played, so they may be of other bands that played the concert as well.
SW4 Festival 2018 Aug 25 - 26, 2018 London, England, United Kingdom Uploaded by Patrick Stone
Rita Ora / MNEK / Sigma Jul 28, 2018 Dundee, Scotland, United Kingdom Uploaded by Millie Armstrong
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